implement toggle/number/text values

Signed-off-by: Folling <mail@folling.io>

src/values/number_value.hpp

@@ -1,5 +1,31 @@
 #pragma once
 
-struct IkarusNumberValue {
-    long double value;
+#include <values/value.hpp>
+
+/// \private
+struct IkarusNumberValue final : IkarusValue {
+public:
+    explicit IkarusNumberValue(long double value):
+        IkarusValue{this},
+        _value{value} {}
+
+    IkarusNumberValue(IkarusNumberValue const&) = default;
+    IkarusNumberValue(IkarusNumberValue&&) = default;
+
+    IkarusNumberValue& operator=(IkarusNumberValue const&) = default;
+    IkarusNumberValue& operator=(IkarusNumberValue&&) = default;
+
+    ~IkarusNumberValue() override = default;
+
+public:
+    [[nodiscard]] long double get_value() const {
+        return _value;
+    }
+
+    void set_value(long double value) {
+        _value = value;
+    }
+
+private:
+    long double _value;
 };